Tracing instrument.



H. M. G. JAHNHOLTZ.

TRAGING INSTRUMENT.

APPLICATION FILED APR. 8. 1908.

fPatented Sept. 14,1909.

UNITED STATES PATENT OFFICE.

HERMANN MARIE CAMILLE JAHNHOLTZ, 0F BORDEAUX, FRANCE.

TRAGING- INSTRUMENT.

To all whom it may concern:

Be it known that I, HERMANN MARIE OAMILLE JAI-INHOLTZ, a citizen of theFrench Republic, residing at Bordeaux, in France, have invented certainnew and useful Improvements in Tracing Instruments, of which thefollowing is a specification.

This invention relates to improvements in tracing instruments and theprincipal object is to provide an instrument for the purpose of tracingand copying drawings and the like by the well known process of pricking.

The invention also provides a very simple and cheap apparatus for thesaid purpose.

The annexed drawing is a vertical section of the apparatus whichcomprises a hollow tube A in the lower part of which the needle holder Bis slidably mounted. The needle C is secured in the. holder by ascrewthreaded ring D or other means for this purpose may be adopted.The'needle holder B is reciprocatable in a hollow cylindrical guide E,its movement being limited by an annular shoulder E in the said guide.The latter carries on its circumference another hollow guide 6 for theguide rod F which the draftsman holds in his hand to follow and prickthe outlines of the drawing to be reproduced. The rod F is secured atthe desired height in the guide 7) by means of a set screw 6 r Theneedle holder B is provided at its upper end with a hook Gr adapted toengage a flexible wire or cord H. In the tube E is located a spring Iwhich tends to thrust the holder B into its position of rest but hassuflicient strength to allow of the needle piercing the drawing. Thecord or wire H, which may have a sheath, passes into a second guide Jcarried by a bearing L in which it is secured by a set screw J. To theend of said cord H is attached a metal disk M perforated for the passageof the threaded gudgeon M of the eccentric N.

The action of the apparatus is as follows.

Specification of Letters Patent.

Application filed April 6, 1908.

Patented Sept. 14, 1909.

Serial No. 425,548.

The eccentric N actuated by a crank or sewing machine wheel or othermeans, exerts a rectilinear pull on the cord H at each revolutiontending to lift the holder B inward whereupon the spring I thrusts theholder outward again; thus enabling a series of pricks to be produced.The hollow tube A is secured to the guide E by a bayonet fastening E orotherwise.

The apparatus can be operated by hand or mechanically and may be usedwith apparatus coupled to the eccentric or to a rod, rocker, pump, etc.,capable of transmitting movements and of regulating the speed, ifnecessary with variable gear.

The shape and dimensions of the parts can be varied as. required and thecord or wire may be of any suitable kind.

What I claim as my invention and desire to secure by Letters Patent ofthe United States is A. tracing instrument comprising a hollow tubularbody having an interior annular shoulder, an implement holder mounted tohave rectilinear movement within said cylinder and limited in itsoutward movement by said annular. shoulder, a flexible member connectedat one end to said holder, and rotatable means connected to the oppositeend of said flexible member adapted to exert intermittent tractiveeflorts on said flexible member to move same rectilinearly of the bodyand move the holder inward relatively thereto, and a spring within thebody adapted to force said holder outward from the body between theaforesaid tractive efforts on the flexible member, substantially asdescribed.

In witness whereof I have signed this specification in the presence oftwo witnesses.

HERMANN MARIE OAMILLE JAHNHOLTZ.

WVitnesses A. PALTEAUx, H. PHILLIPS.

